✔ Integrate Google Play Services
Make sure you’ve implemented the latest Google Play Services version

✔ Override the Activity Lifecycle Method
Override the onPause(), onResume() methods in each of your activities

✔ Set the Listeners
Register to the Listeners of the ad units you set up earlier on the ironSource platform

✔ Set UserID
If serving the Offerwall ad unit or using server-to-server callbacks to reward your users (for Rewarded Video or Offerwall), you must set the UserID. In addition, the userID parameter must be set before you make the init request.

✔ Init the SDK
Initialize the SDK using the app key generated on the ironSource platform. We recommend referring to the ad units you set up earlier in the ad unit parameter like this IronSource.init(this, appKey, YOUR_AD_UNITS);